Machine for forming pulley-block straps



n 3 Sheets-Sheet 1. F. D. BARTLETT. MACHINE FOR FORMING BULLEY BLOCK STRAPS. No. 268,982. Y

(Model.)

Patented Dec. 12, 1882.*v

Wneqs as: Q` A N. ETERS. Phawlnhognpnr. wasningann. n. cv

(Model.) 3 sheets-sheen 2.

F. D. BARTLETT. MACHINE FOR PORMING' PULLBY-BLOK STRAPS.

2. No 268 98 wzgltente/d Deo 12 1882 lll/Illa.

N ETERS, Phommbngmpher. wnninglun. D, C.

(Model.) 3 Sheets- Sheet 3.

P. D. BARTLETT.

MACHINE FOR FORMING PULLEY BLOCK STRAPS.

Y Patented Deo. 12, 1882.

N4 Ferias. Pnmmumognpher. wnhinmnn, D, c.

UNITED STATES PATENT EEicE.

FRANK D. BARTLETT, OF BOSTON, MASSACHUSETTS.

MACHINE FOR FORMING PuLLEY-BLOCK STRAPS.

SPECIFICATION forming part of Letters Patent No. 268,982, dated December 12, 1882.

' Appneauonnied December 7,1881. Mouei.)

To alt whom it may concern:

Be it known that I, FRANK D. BAETLETT, a citizen ot' the United States, residing at Boston, county of Suffolk, and State of Massachusetts, have invented new and useful Improvements in Machines for Forming Pulley-Block Straps, Ste., ot' which the following is a specication.

- My invention relates to improvements in machines for forming pulley-block straps, and the particular matter which constitutes my improvement will be hereinafter particularly described and made the subjectof specific claims.

Referring to the accompanying' drawings, Figure] represents a top view of the machine, showing the several operatingparts in the positions they occupy at the commencement ot' the operation of forming the strap; Fig. 2, a similar view showing the forming parts only 'in the positions they occupy when the strap is partially formed; Fig. 3, a similar view showring the forming parts onlyin the positions they occupy when the strap is completed; Fig. 4, a vertical longitudinal section, the parts being in the positions shown in Fig. l; Fig. 5, a similar sectional view, the parts beingin the positions shown in Fig. 2; Fig. 6, a vertical transverse section, the parts being in the positions shown in Fig. l; Fig. 7, a similar sectional view, the parts being in the positions shownpin Fig. 3; Fig. S, a similar sectional View taken on the line m met Fig. 1, the parts being in the positions shown in Fig. 3; and Fig. 9, a vertical longitudinal section, showing the forming device in position to allow of the removal ofthe formed strap. l

A suitable frame supports a cast-iron bedplate, A, upon which the several operating parts are arranged. The die-forming parts are arranged at one end of the bed-plate and the operating connections at the other.

It will he understood that the formed strap u, Fig. 9, is bent with its ends a', Fig. 3, parl allel to each other, the bend having the form ofthe block, and in cross-section is of a concavoconvex shape, to suit the groove around the block.

A die, M2, is de tachably secured to the liedplate A, with its die part a2 proper of semicircular recessed form and in cross-section the counterpart of the outer concave side of the formed strap. This die gives the bend to the strap and the concave-convex form tothe bent part, in connection with a former,7 M, having the'counterpart in cross-section of the die. The formeris mounted upon a short slide, L tted to be moved in a longitudinal groove or slot,

K, in the bed-plate toward and from the die, into the recess in which the former is driven with the strap to give it the form stated.

The former is composed of two cavettomolded sections, m m', mounted upon a vertical stem, L', fixed to the short slide L, the up- Y.

per section, m, of said former being movable, for a purpose to be presently stated. These sections m m are placed upon the stem L', so that their smaller ends will join, the profile of the sections so joined being the counterpart in cross-section of the die and of the formed strap. These former parts are also detachably secured to the stem. Dies Q, arranged to slide in guides at right angles to and adjacent to the recessed face ot' the fixed die M2, and on each side ofthe longitudinal slot K in the hed-plate, are adapted to be moved toward each other and against the sides of the strap to complete the bend and concave-convex form thereot' when the former is driven into the xed die. For this purpose these sliding dies are formed at c o in cross-seotion the counterpart of the former and ot' the fixed die, and with hat faces c c', to give the proper parallel relation to the ends a ot the strap while completing its form,

bed-plate pins or studs b b, against which the o strap is placed edgewise upon the bed-plate,

and by which it is held in proper position across the path of the former to be struck and carried forward by it. 'These studs are provided with caps or T-heads b', beneath which IOO the strap is placed with its at side against the studs, across the slot, and behind the former, and the ends of the strap are thus supported as the former strikes and carries it against the die, as shown in Fig. l.

The driver-bar J and the slidingdies Q may be operated by any suitable mechanism. That shown gives the advantage of placing the control of the forming parts under the operator.

A crank-shaft, B, is mounted in suitable bearings upon the bed-plate, and operates at will the driver-bar which operates the forming device. That part of the driver-bar which strikes and forces the former and the strap into the die'is narrow and placed edgewise in central relation tothe former, and of a height above the bed-plate about equal to the width ofthe strap being formed. The other end of the driver-bar has a cross-head, J', fitted to move in guides J2 on the bed-plate, and having a top recess or cavity, B2, while a pitmanrod, I, on the crank Gr is carried by a crosshead, A2, having a projection or tenon, a3, in

such relation to and above the driver-bar crosshead that the tenon of the pitman cross-head Will, when depressed, enter the cavity B2, and thus connect the pitman-rod with the driverbar.to impart to the latter a-reciproca-tingmotion. 1

. The vcross-head of the pitman is carried in Ways 12, mounted upon springs a4 a4, which constantly exert their force to effect and maintain the disconnection of the pitman-rod from the driver-bar, as in Fig. et, in order 'that the vlatter may remain inoperative while-the strap is being placed in position for operation, and to allow of the removal of the formed strap without interfering with the continuous motion of the crank-shaft.

The connection of the pitman-rod with the driver-bar to operate the latter may be made by a hand-lever pivoted to the bed-plate and arranged across and upon the yielding ways l2, with its handle in position to be controlled by the Workman. As shown, however, such connection is effected by a treadle, R, or handlever pivoted to the frame beneath the bedplate and connected by vertical rods R' with the yielding ways I2, which carry the pitman time. Such `connection and disconnection is effected in a manner similar to the pitman-rod and driver-bar connection. For this purpose the free ends of the rods N N are supported and carried by yielding ways N' N', and have tenons or projections a, adapted to be depressed simultaneously each into a cavity, n', in the upper surface of said die-blocks by means of a treadle, P, or hand-lever, pivoted to the under side of the frame and connected to said yielding ways N by vertical rods P', so that the depression of the treadle or hand-lever at once connects the rods N N with the said dies and causes them to be reciprocated, and upon the release of the treadle such connection is interrupted. When adapted for uninterrupted operation the rods NN have fixed connection with the dies in any suitable manner.

The slides of the forming device and ofthe driver-bar are tted within the slot K, so as to move freely upon tongue-and-groove connections, so that these parts cannot be displaced under the force exerted by the crank upon the driver-bar.

The side shafts, E E, are operated .by bevelgear F F meshing with the bevel-gear D D on the crank-shaft, which is driven bya belt or belts leading from the pulleys C C to any suitable power. Balance-wheels are mounted on the crank-shaft B, :if desired.

It will be understood that the extent ofthe movement ofthe driver-bar is equal to the throw ofthe crank Gr, and just sufficient to give the required pressure to form the strap over the die, the former in suchoperation Serving as the matrix for the dies.

1t will also be understood that the throw of the cranks H H is just sufficient to give the required pressure to the side dies to complete the formation of the strap around the former.

The forming device proper is composed ot the sections m m', the slide L, and the stem L', and the upper section, m, is adapted by any suitable means to be held. tirmly upon the base-section during the operation of forming the strap, and may be removed from its holding-stem to allow the work to be removed. rlhe upper section, as shown, is adapted for vertical movements upon the stem L', and a cam-lever, S, pivoted to the stem, serves, when depressed, to hold the upper sectiomm, rmly upon the base-section against the force exerted by the dies andthe driver-bar in forming the strap. Springs d connect the upper section to a cross-arm, e, of the stem L, so that when the cam-lever S is raised from its holding position these springs lift the upper former-section, m, and hold -it sufficiently above the base-section, as shown in Fig. 9, to free the formed strap 'and allow it to be removed, the forming device, with the strap, being first moved away from the dies. f

The slides which carry the driver-bar and the forming device are not connected, leaving the latter free to be moved out ofthe die by hand as soon as the side dies have been withdrawn from the forming device.

The former-sections and the dies are adapted for removal and replacement by others for different sizes of straps and for different kinds of work, such as chain-links, thimblcs,'andA IOO different forms of straps for single pulleyblocks and for reeting pulley-blocks.

The ironv to be wrought into the straps is iirst cut to the necessary length and punched atthe ends. The strap, being heated to a red heat, is placed edgewise, as in Fig.'1,upon the bed-plate, behind the former and against the studs b b, the T heads b of which serve to hold the ends of the strap in proper position When struck by the former, which is driven against the strap, and the latter in turn is driven against the fixed die and is bent over the former and given the desired form by the force and pressure of the driver-bar. rlhe action of the fixed die is immediately succeeded by the action of the side dies, which are caused to advance-toward each other, being properly timed for the purpose, and press the ends of the strap inward around the former to complete the bend and form of the strap. In this operation ofthe side dies their flat faces press the ends ot' the strap against the opposite sides of the driverbar and leave its punched endsin parallelpositions, as shown in Fig. 3. The return movements of the driver-bar and of the side dies leave the forming device in position to be moved by hand away from the dies, and upon the release ofthe holding device ofthe upper section of the former it is or may be freed from the formed strap, leaving it free to be pushed l or drawn from the former, inreadiness to be put around the block.-

The treadle and hand-lever are arranged so that the workman may from the forming end of the machine control the movements of the side dies and ot' the driver-bar, as stated.

As the strap must have the exact form of the block, it will be noticed that the dies and the former are adapted to give such form, and that forthis purpose thecorners ofthe sliding dies form a continuation of the fixed recessed die part when the dies are closed upon the strap, leaving its ends straight, by which to properly secure the strap upon the block.

The fixed die is secured in a 'suitable holisin g in the bed-plate, and the adaptation for the removal and replacement of the forming parts by others of dierent sizes or form increases the working capacity of the machine.`

For single blocks the strap will be formed round at the top, as shown; but in double and treble blocks the top of the second strap is somewhat oval. This is also true ofthe third` strap where there are three blocks.

For making chain-links and thimbles the former and the dies would be varied.

I am aware of the Patent No. 264,268, dated September 12, 1882, for machine for forming pulley-block straps, and my claim is not intended to cover the machine described and shown in said patent, but the improvement thereon, which consists of a combination ot' elements embracing the pitman-rod adapted 'for connection and disconnection with the sliding'driver-bar which operates the forming device, the side crank-shafts and their pitkman-rods, yielding guides for theA latter, and

suitable gearing for connectingthesaid crankshafts for operation in connection with the sliding driver-bar, the forming device, and the tixed and sliding dies.

The specific construction by which the connection and disconnection of the several pitfor said pitman-rods, and suitable gearing for connecting the said crank-shafts, substantially as described, for the purpose specified.

2. In combination, the fixed die M2, the sliding side dies, Q Q., the sliding driver-bar J, havingthe recessed cross-head B2, the independent sliding forming device interposed between said tixed die and said driver-bar, the

crank-shaft B, the pitman-rod I, having the tenon c3, the cross-head A2, the guides l2, the J springs a4, and the treadle P, all constructed and arranged for operation as described, for the purpose specified.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

FRANK D, BARTLETT.

Witnesses:

H. S. HUPs,

EDWARD P. PAYsoN.

IDO 

